Walter Bright talks about D and his desire to improve on systems programming languages. Many successful concepts from other languages like JavaScript, PERL, Ruby, Lisp, Ada, Erlang, Python, etc., have had a significant influence on D, he says. He adds: "D 1.0 was pretty straightforward stuff, being features that were adapted from well-trod experience in other languages. D 2.0 has ventured into unexplored territory that doesn't have a track record in other languages. Since these capabilities are unproven, they generate some healthy skepticism. Only time will tell."